Electromagnetic

  • Magnetic field — Measure deviations from natural magnetic field densities caused by ferrous objects
  • Derivatives & filters — Processing of magnetic field
  • Vertical gradiometer — Measure the differences with two sensors offset vertically
  • Infrared imaging — Measure & image the infrared reflectivity & radiation of flora, rocks & oil sludge,
  • Laser scanning — 3D laser theodolite scanning of tunnels, bridges & structures
  • Photography — Obtain orthorectified normal, oblique & aerial photography
  • Ground penetrating radar (GPR) — Acquire, process & interpret the reflectivity of 100MHz electromagnetic waves below the ground surface; velocity estimation
  • Underwater & aerial video — Obtain video as independent evidence in underwater or subsurface survey